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SECTION 2 - OPERATION
2-79
Low Coolant Level
The Electronic Instrument Control System will
notify the operator that the engine coolant level
has dropped 4.5 L (5.3 US qts) below the
acceptable fill level in the radiator.
Simultaneously, the module of the Cummins
engine will begin an engine derate sequence
that will protect the engine from harm due to low
engine coolant. A low coolant level condition
can overheat the engine, causing extensive
engine damage. See “Engine” in Section 4 of
the Operator’s manual for possible causes of
low engine coolant. Failure to correct the low
engine coolant condition can cause serious
damage to the engine. The following description
details the reaction of the EICS and Cummins
module in the event of low engine coolant level:
With the engine running and the coolant level
4.5 L (5.3 US qts) below the acceptable fill level
in the radiator, the low engine coolant light, 1, on
the warning light bar will illuminate. The EICS
will not react in any other fashion (no error
message, no audible alarm). Pressing the
acknowledge/reset button on the dash will not
cancel the low coolant level lamp on the EICS.
The light will only turn off when the coolant level
returns to the proper level.
The module will also sense the low engine
coolant level and begin an engine power derate.
Engine speed will not be affected by the derate
in power, and the Operator will have full range of
engine speed available using the hand throttle.
The module will lower the horsepower output of
the engine a preset amount (20% of gross
horsepower) as long as the low engine coolant
condition exists.
The engine power derate will be gradual as long
as the condition exists on the tractor and the
engine is running. Elapsed time of the power
derate from maximum horsepower to the derate
output level will be approximately 25 seconds
(approximately 1% horsepower/second). This
reduced power output mode will allow the
Operator to move the tractor from an
undesirable location in order to make repairs.
1
Figure 2-110